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Diff for /src/usr.bin/ssh/Attic/crc32.c between version 1.8 and 1.8.8.2

version 1.8, 2000/12/19 23:17:56 version 1.8.8.2, 2003/09/16 21:20:25
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   /*      $OpenBSD$       */
   
 /*  /*
  *  COPYRIGHT (C) 1986 Gary S. Brown.  You may use this program, or   * Copyright (c) 2003 Markus Friedl.  All rights reserved.
  *  code or tables extracted from it, as desired without restriction.  
  *   *
  *  First, the polynomial itself and its table of feedback terms.  The   * Redistribution and use in source and binary forms, with or without
  *  polynomial is   * modification, are permitted provided that the following conditions
  *  X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0   * are met:
    * 1. Redistributions of source code must retain the above copyright
    *    notice, this list of conditions and the following disclaimer.
    * 2. Redistributions in binary form must reproduce the above copyright
    *    notice, this list of conditions and the following disclaimer in the
    *    documentation and/or other materials provided with the distribution.
  *   *
  *  Note that we take it "backwards" and put the highest-order term in   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  *  the lowest-order bit.  The X^32 term is "implied"; the LSB is the   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  *  X^31 term, etc.  The X^0 term (usually shown as "+1") results in   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  *  the MSB being 1   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  *   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  *  Note that the usual hardware shift register implementation, which   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  *  is what we're using (we're merely optimizing it by doing eight-bit   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  *  chunks at a time) shifts bits into the lowest-order term.  In our   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  *  implementation, that means shifting towards the right.  Why do we   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  *  do it this way?  Because the calculated CRC must be transmitted in   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *  order from highest-order term to lowest-order term.  UARTs transmit  
  *  characters in order from LSB to MSB.  By storing the CRC this way  
  *  we hand it to the UART in the order low-byte to high-byte; the UART  
  *  sends each low-bit to hight-bit; and the result is transmission bit  
  *  by bit from highest- to lowest-order term without requiring any bit  
  *  shuffling on our part.  Reception works similarly  
  *  
  *  The feedback terms table consists of 256, 32-bit entries.  Notes  
  *  
  *      The table can be generated at runtime if desired; code to do so  
  *      is shown later.  It might not be obvious, but the feedback  
  *      terms simply represent the results of eight shift/xor opera  
  *      tions for all combinations of data and CRC register values  
  *  
  *      The values must be right-shifted by eight bits by the "updcrc  
  *      logic; the shift must be u_(bring in zeroes).  On some  
  *      hardware you could probably optimize the shift in assembler by  
  *      using byte-swap instructions  
  *      polynomial $edb88320  
  */   */
   
   #include <sys/types.h>
 #include "includes.h"  
 RCSID("$OpenBSD$");  
   
 #include "crc32.h"  #include "crc32.h"
   
 static u_int crc32_tab[] = {  static const u_int32_t crc32tab[] = {
         0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,          0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL,
         0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,          0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L,
         0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,          0x0edb8832L, 0x79dcb8a4L, 0xe0d5e91eL, 0x97d2d988L,
         0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,          0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 0x90bf1d91L,
         0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,          0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
         0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,          0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L,
         0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,          0x136c9856L, 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL,
         0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,          0x14015c4fL, 0x63066cd9L, 0xfa0f3d63L, 0x8d080df5L,
         0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,          0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 0xa2677172L,
         0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,          0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
         0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,          0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L,
         0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,          0x32d86ce3L, 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L,
         0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,          0x26d930acL, 0x51de003aL, 0xc8d75180L, 0xbfd06116L,
         0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,          0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 0xb8bda50fL,
         0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,          0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
         0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,          0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL,
         0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,          0x76dc4190L, 0x01db7106L, 0x98d220bcL, 0xefd5102aL,
         0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,          0x71b18589L, 0x06b6b51fL, 0x9fbfe4a5L, 0xe8b8d433L,
         0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,          0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 0xe10e9818L,
         0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,          0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
         0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,          0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL,
         0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,          0x6c0695edL, 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L,
         0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,          0x65b0d9c6L, 0x12b7e950L, 0x8bbeb8eaL, 0xfcb9887cL,
         0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,          0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 0xfbd44c65L,
         0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,          0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
         0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,          0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL,
         0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,          0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L,
         0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,          0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L,
         0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,          0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L,
         0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,          0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
         0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,          0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L,
         0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,          0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL,
         0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,          0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL,
         0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,          0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L,
         0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,          0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
         0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,          0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L,
         0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,          0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL,
         0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,          0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L,
         0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,          0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 0x67dd4accL,
         0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,          0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
         0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,          0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L,
         0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,          0xd1bb67f1L, 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL,
         0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,          0xd80d2bdaL, 0xaf0a1b4cL, 0x36034af6L, 0x41047a60L,
         0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,          0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 0x4669be79L,
         0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,          0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
         0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,          0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL,
         0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,          0xc5ba3bbeL, 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L,
         0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,          0xc2d7ffa7L, 0xb5d0cf31L, 0x2cd99e8bL, 0x5bdeae1dL,
         0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,          0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 0x026d930aL,
         0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,          0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
         0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,          0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L,
         0x2d02ef8dL          0x92d28e9bL, 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L,
           0x86d3d2d4L, 0xf1d4e242L, 0x68ddb3f8L, 0x1fda836eL,
           0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 0x18b74777L,
           0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
           0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L,
           0xa00ae278L, 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L,
           0xa7672661L, 0xd06016f7L, 0x4969474dL, 0x3e6e77dbL,
           0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 0x37d83bf0L,
           0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
           0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L,
           0xbad03605L, 0xcdd70693L, 0x54de5729L, 0x23d967bfL,
           0xb3667a2eL, 0xc4614ab8L, 0x5d681b02L, 0x2a6f2b94L,
           0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 0x2d02ef8dL
 };  };
   
 /* Return a 32-bit CRC of the contents of the buffer. */  u_int32_t
   ssh_crc32(const u_char *buf, u_int32_t size)
 u_int  
 ssh_crc32(const u_char *s, u_int len)  
 {  {
         u_int i;          u_int32_t i, crc;
         u_int crc32val;  
   
         crc32val = 0;          crc = 0;
         for (i = 0;  i < len;  i ++) {          for (i = 0;  i < size;  i++)
                 crc32val = crc32_tab[(crc32val ^ s[i]) & 0xff] ^ (crc32val >> 8);                  crc = crc32tab[(crc ^ buf[i]) & 0xff] ^ (crc >> 8);
         }          return crc;
         return crc32val;  
 }  }
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